Mounting of cylinders in motors



Patented Aug. 22, 1939 MOUNTING OF cYLINDERs IN MOTORS Marius Jean-Baptiste Barbarou, Neuilly-sur- Seine, France Application July 8, 1937, Serial No. 152,589 In France September 9, 1936 3 Claims. (circa-17s) This invention relates to the mounting of the cylinders or cylinder liners in motors, and it is particularly applicable to internal combustion engines, e. g., aviation motors, comprising a circulation of cooling fluid.

In the known arrangements, the cylinders are simply placed against the cylinder head and held by means of suitable bolts. They can also be screwed into the cylinder head, the joint being squeezed between the cylinder and the cylinder head to ensure tightness; but the connection between materials of difierent expansions necessitates giving in advance a sufiicient initial clamping which is generally obtained by heating one of the parts before assemblage.

Now these necessary thermal conditions are kept constant in the course of the mounting, with difficulty especially when it is a question of a multi-cylinder block and the difierences of temperature inevitable in practice have as a result variable conditions of clamping from one cylinder to the other cylinder and a tight joint may sometimes not be fully ensured.

It is therefore an object of this invention to ensure whatever may be the expansions of the as sembled parts, a more perfect tightness of joints whilst at the same time making the production and the mounting of the said parts easier.

It is also an object to place between a cylinder head and a cylinder, otherwise constituted in known manner, a double conical joint between the said parts, the tightening of the two joints being effected at ordinary temperature. One of the joints is centred internally in a recessed shoulder of the cylinder head against which it is squeezed; the second is centred on the cylinder liner being supported on a rim of the said cylinder. The generatrices of the two cones of the same aperture are in contact and. may have a sliding movement one with respect to the other, sufficient play being provided in the recess of the said joints to permit their deformation.

It is preferred to make use of joints in malleable metal such, for example as aluminium, so that they can alter in shape under the tightening. Such a mounting is perfectly leak-proofed; expansion of the order of several tenths of a millimetre due to heat, can be easily taken care of without leakage.

In order that my invention may be clearly understood and readily carried into effect a drawing is appended hereto illustrating embodiments thereof, and wherein the figure shows in diagrammatic and partial section a cylinder of an internal combustion engine, comprising a water jacket and constructed according to the invention.

The motor cylinder head is indicated by the reference numeral I; in the said cylinder head is partially shown a supply pipe 2 and a valve 3.

The cylinder or liner 4 is a cylindrical sleeve which comprises at the top part on the side of the explosion chamber a circular outer shoulder 5. A recessed part 6 in the cylinder head I serves to take two conical rings 1 and 8, the cylindrical parts of which are arranged externally for the ring 1 and internally for the ring 8.

The ring I is supported against the cylinder head and the shoulder 9 forming the base of the recess 6. The ring 8 is located on the rim 5. The generatrices of the cones are in contact and a play is provided at l!) and H in order to permit clamping or tightening without abutment.

The liner is centred on the one hand by the circular rim 5 and the other hand by the cylinder head proper, at the top.

In the example the joint of the cylinder head I with the casing I2 is indicated at [3 and the liner is also centred in the casing by a second circular shoulder M.

In order to obtain the clamping desired it is sufficient to ensure on the liner a suitable pressure which is transmitted by the shoulder 5 to the ring 8.

I claim:

1. Means for sealing joints between a cylinder head and cylinder liner of an internal combustion engine, comprising a pair of opposed conical rings provided between the interior of the cylinder head and the exterior of the liner to which the cylinder head is fitted, the opposed rings being adapted to form a wedging action by the axial pressure effected by the attachment of the head to the cylinder.

2. Means for sealing joints between a cylinder head and cylinder liner of an internal combustion engine, comprising opposed axially spaced abutments on the exterior of the cylinder liner and the interior of the cylinder head, and concentrically related conical rings interposed between said abutments, the rings being adapted to be pressed in axially opposite directions to effect a wedging action between liner and head when said last is secured, in operative position 3. In an internal combustion engine having a cylinder liner and cylinder head, an annular inpermit play, and means for clamping the head in operative position, whereby the wedging action of the rings between liner and head effectively effects a sealing action therebetween.

MARIUS JEAN-BAPTISTE BARBAROU. 

